* Generate screenshot images for markers
In some scenarios it might not be possible to use the preview video or
image of markers, i.e. when only static images are supported like in
Kodi. So generate a static screenshot as well.
* Make generating animated and static image optional for markers
* Use screenshot for markers when preview type is set to static image
* Make config instance-based
* Remove config dependency in paths
* Refactor config init
* Allow startup without database
* Get system status at UI initialise
* Add setup wizard
* Cache and Metadata optional. Database mandatory
* Handle metadata not set during full import/export
* Add links
* Remove config check middleware
* Stash not mandatory
* Panic on missing mandatory config fields
* Redirect setup to main page if setup not required
* Add migration UI
* Remove unused stuff
* Move UI initialisation into App
* Don't create metadata paths on RefreshConfig
* Add folder selector for generated in setup
* Env variable to set and create config file.
Make docker images use a fixed config file.
* Set config file during setup
* Add regex string filter criterion
* Use query interface for auto tagging
* Use Query interface for filename parser
* Remove query regex interfaces
* Add selective auto tag
* Use page size 0 as no limit
* Implement parallel scanning and generation, and combined scanning/preview/sprite generation.
* Added UI component for preview/sprite generation during scan, and configurable number of parallel tasks.
* Add v050 changelog entry
* Add lint/format checks to build
* Make travis get full repo to get tags
* Run packr2 once in cross-compile
* Fix quotes in package.json
* Fix linting issues
* Formatting
* Fix vet issue
* Fix go lint issues
* Show start of each platform compilation
* Add validate target
* Set gitattributes for go fmt and mod vendor
* Fix tag name
* Add fmt-ui target
* Make mutating metadata ops mutation
* Implement scene generate screenshot
* Remove fetch policy on metadata mutations
* Port UI changes to v2.5
* Set generated image in database
* Added exclude file from scan feature
* Abort exclusion instead of panicking when pattern isn't valid
* Added UI configuration for exclude patterns
* * cosmetic fixes
* changed behavior of exclude function to continue and ignore invalide regex patterns
* added some more tests (windows networks and continue after regex error)
* Add auto tagging for performers, studios and tags
* Fix scene title logging
* Fix golang 1.11 compile error
* Improve regex pattern. Only log when added
* Remove paging from parse query
* Add integration test
* Fix prefix detection on paths
